Yes, it is possible for a black puppy to turn grey.This can happen over time due to the effects of normal aging, or it can happen as a result of a hormonal imbalance or health condition. As puppies age, their coat can fade and darken, often turning from black to a duller shade of grey.
Hormonal imbalances, such as those caused by hypothyroidism and Cushing’s Disease, can also cause a black puppy to turn grey. In both cases, a trip to the vet is advisable to make sure that your puppy is in good health and to determine the cause of the graying fur.